Police aviation in United Kingdom provides the British police with an aerial support unit to assist them in pursuit, surveillance and tracking. The most common air support aircraft is the Eurocopter EC 135T, which is equipped with daytime and night vision video equipment, instrument flight rules systems and radio equipment to track suspects and liaise with officers on the ground.
While most aerial units operate helicopters, some forces also use of aeroplanes such as the Britten-Norman Defender. An aeroplane allows higher and quieter surveillance, making it less likely that suspects will become aware they are being watched. A light aircraft also allows for longer flying time and lower running costs.
Police aviation in England and Wales was once a force-by-force organisation, however from April 2012 it became centralised as a National Police Air Service.
In 1921, an R33 Airship was able to help the police in traffic control around the Epsom and Ascot horse-racing events.
The large mural depicting the 1936 Battle of Cable Street public order incident on the side of St. George's Town Hall in the East End of London depicts the police autogyro overhead that was present on the day.
With scramble times of just four minutes for helicopters, or with standing patrols using fixed-wing aircraft, aerial units are faster than ground units and can often be first on the scene to reported incidents.
Aerial units are often tasked to assist in vehicle pursuits. Air support allows ground units to disengage and follow from a discreet distance, hopefully making the pursuit less dangerous while still allowing ground units to be able to close in quickly as directed to apprehend suspects. Aerial surveillance also allows the police to anticipate the direction of the pursuit, and position ground units ahead of the suspect to block roads or deploy spike strips. Aerial units can also be used to efficiently locate missing persons.